Tests for Ions and Their Colours

Which ion produces a bright yellow flame in a flame test?

• Calcium

• Sodium

• Potassium

• Copper

What is the flame test colour for potassium ions?

• Brick red

• Lilac

• Green

• Blue

Which ion gives a brick red colour in a flame test?

• Calcium

• Lithium

• Sodium

• Barium

What is observed when sodium hydroxide solution is added to a solution containing iron(II) ions?

• Blue precipitate

• Green precipitate

• Brown precipitate

• White precipitate

Which ion forms a blue precipitate with sodium hydroxide solution?

• Iron(II)

• Iron(III)

• Copper(II)

• Calcium

What colour precipitate is formed when sodium hydroxide is added to a solution containing aluminium ions?

• Blue

• Green

• White (dissolves in excess NaOH)

• Brown

Which halide ion produces a cream precipitate when silver nitrate is added after acidifying with dilute nitric acid?

• Chloride

• Bromide

• Iodide

• Fluoride

What is the colour of the precipitate formed when silver nitrate is added to a solution containing chloride ions?

• White

• Cream

• Yellow

• Blue

Which halide ion gives a yellow precipitate with silver nitrate solution?

• Chloride

• Bromide

• Iodide

• Fluoride

What is the test for carbonate ions?

• Add dilute hydrochloric acid and look for effervescence

• Add sodium hydroxide and heat

• Add silver nitrate

• Add barium chloride